Heater



FIG. 1 is a perspective view of a heater, showing the new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a first side view thereof;

FIG. 5 is a second side view thereof;

FIG. 6 is a top view thereof;

FIG. 7 is a bottom view thereof; and,

FIG. 8 is another perspective view.

The broken lines shown in the drawings are for the purpose ofillustrating portions of the article and form no part of the claimeddesign.

CLAIM The ornamental design for a heater, as shown and described.